Dave,

Do you feel like you are like you are completing your backswing. Your timing might be a little off.

Try a little counting drill, on the backswing try counting out loud, "one and" then on e the trough swing count "two".
On the backswing if your through swing starts before you say and it could be a timing issue.

If you think it's your grip look at grip pressure first. You may be getting tight through the swing.

GolfBald